9943679525 has 24 divisors (see below), whose sum is σ = 14059740744. Its totient is φ = 6911078400.

The previous prime is 9943679513. The next prime is 9943679527. The reversal of 9943679525 is 5259763499.

It is a Cunningham number, because it is equal to 99718²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 4856138596 + 5087540929 = 69686^2 + 71327^2 .

It is not a de Polignac number, because 9943679525 - 2⁸ = 9943679269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9943679527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 894356 + ... + 905405.

It is an arithmetic number, because the mean of its divisors is an integer number (585822531).

Almost surely, 2^9943679525 is an apocalyptic number.

It is an amenable number.

9943679525 is a deficient number, since it is larger than the sum of its proper divisors (4116061219).

9943679525 is a wasteful number, since it uses less digits than its factorization.

9943679525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799801 (or 1799796 counting only the distinct ones).

The product of its digits is 18370800, while the sum is 59.

The square root of 9943679525 is about 99718.0000050141. Note that the first 5 decimals coincide. The cubic root of 9943679525 is about 2150.3824468384.

The spelling of 9943679525 in words is "nine billion, nine hundred forty-three million, six hundred seventy-nine thousand, five hundred twenty-five".